Ceramic radiant broiler burner



May 15, 1956 A. H. CRONE CERAMIC RADIANT BROILER BURNER Filed July 19,1951 171M912 far MW W1 W United States Patent'() CERAMIC RADIANT BROILERBURNER Albert H. Crone, Rockford, 111., assignor to Geo. D. RoperCorporation, Rockford, 111., a corporation of Illinois Application July19, 1951, Serial No. 237,637

6 Claims. (Cl. 158-113) This invention relates to a radiant broiler forgas stoves.

An object of this invention is to provide a ceramic radiant body ofnovel construction which adapts it for efiicient use in the broilerportion of gas stoves.

Another object of the invention is to provide a novel assembly of aceramic radiant body on the gas burner tube of the broiler in a gasstove wherein the efiective radiating portion of the ceramic bodyclosely overlies the flame ports of the burner tube without interferingwith complete combustion at the flame ports. 7

Another object of this invention is to provide a ceramic radiant bodyformed with a plurality of depending ribs positioned to be heated by theflame jets of a gas burner tube when the ceramic body is assembled onthe gas burner tube.

Another object of this invention is to provide for the dissipation ofthe gases of combustion from the gas burner tube by which the ceramicradiant body is heated.

Another object of this invention ,is to provide a plurality of identicalceramic radiant bodies, each adapted to be mounted along any segment ofthe gas burner tube in the broiler so as to be interchangeable andreadily replaceable.

Other and further objects and advantages of the invention will beapparent from the following description.

In the drawings:

Figure l is a perspective view of the gas burner tube of the broiler ina gas stove;

Fig. 2 is a fragmentary perspective view showing the assembly of theceramic radiants of the present invention on, a segment of the gasburner tube;

Fig. 3 is a side view of an individual ceramic radiant bodyaccording tothe present invention;

Fig. 4 is a bottom view thereof; V

Fig. 5 is a section across the middle of the ceramic radiant body; and Va Fig. 6 is a fragmentary end view of a portion of the gas burner tubeand ceramic radiant assembly, showing the relation of the ceramicradiant to the burner ports on the gas burner tube. V p

Each ceramic radiant according to the present'im'ention is formed as anintegral molded clay body having a pair of spaced, oppositely positionedmarginal portions 1 and a bridging portion 2 adapted to overlie the gasburner tube of the broiler and provide a physical support for themarginal portions 1. Each marginal portion is formed with a plurality ofrelatively thin depending ribs 3 spaced evenly along the length of theradiant body The ribs 3 are interconnected by a relatively thin upperwall 4 in which there are formed apertures 5 between each pair of ribs.These apertures are preferably made as small as possible consistent withgood combustion at the burner tube flame ports of the broiler, as will.be described hereinafter. i

The bridging portion 2 is of a thickness and mass suflieient to make theintegral ceramic body strong enough for its intended use. Identicalrectangular recesses 6 are formed through the bridging portion 2 ateither end 2,745,480 Patented May 15, 1956 thereof half-way between themarginal portions 1. Partially cut away portions 7 and 8 on the bottomface of the bridging portion 2 at either end thereof extend away fromthe rectangular recess 6, and terminate in depending, flat-bottomed legs9 and 10, which extend along the entire length of the ceramic body atthe junctures of the bridging portion 2 and the marginal portions 1.Between the ends of the ceramic body segments '11 and 12 are cut away atthe bottom to reduce the mass of the bridging portion 2. A transversestrengthening rib 13 extends across the bottom of bridging portion 2between the ends thereof and is formed with a rectangular recess 14 atits middle. Strengthening ribs 15 extend outwardly from the bridgingportion to overlie the upper wall 4 of each marginal portion 1.

The gas burner tube 16 for the broiler assembly is supplied with acombustible air gas mixture through mixer 17. The upper face 18 of thegas burner tube is cambered to provide surfaces which slope downwardfrom the middle of the tube along its length toward its sides. A centralupstanding rectangular ridge 19 extends lengthwise along the middle ofthe upper face of the gas burner tube. Rectangular lugs Zil extendupward from this ridge at evenly spaced intervals along its length.Generally wedge-shaped projections 21 are also formed on the upper faceof the gas burner tube extending from the sides thereof inward towardthe lugs 29 in alignment therewith. The upper faces 22 of theseprojections 21 are flat and are disposed horizontal. A plurality of gasports 23 are formed on the sides 24- of the gas burner tube and aredirected outwardly and at a slight down-- ward angle.

When assembled, the ceramic radiant bodies are mounted on the top of thegas burner tube to overlie the same. Each ceramic body is disposedbetween a pair of the upstandingcentrally-located burner tube lugs 26,with the rectangular recesses 6 at either end of the radiant body snuglyengaging the adjacent lug 20 for half the length of the latter. in thismanner, each lug 20 serves as a locator for the adjacent ends of tworadiant bodies. The upper flat faces 22 on the burner tube serve asmounting surfaces for the depending legs and id of the ceramic bodies.The central rectangular recess 14 on the underside of each ceramic bodysnugly seats overrthe central upstanding ridge 190p the burner tube.

By the provision of these locating studs or ridges on the burner tubeand the mating recesses on the ceramic bodies, it will be seen that theceramic bodies assume ports permit the escape of the gases ofcombustion.

a predetermined position relative to the burner tube when mountedthereon The spacing of the flame ports 23 on the burner tube and thespacing and location of the depending ribs 3 on the ceramic bodies aresuch that each rib 3 is disposed above and between a pair of flameports,

there being twiceras many-flame ports as ribs; The decold material overthe flames and thereby permits combustion at the ports 23 to be fullycompleted. This construction of the upper walls, plus the locating ofthe ribs 3 at a predetermined position between flame ports 23, permitthe ribs 3 to be positioned closely adjacent the flame ports 23 and beheated much faster thereby. This was not possible in formerconstructions of ceramic radiant broilers because of the smotheringeffect of a large mass of cold ceramic material overlying the flameports, such that it was found to be necessary to space the ceramic bodyfrom 1 to 1% inches above theflame ports to insure complete combustionof the gas under all circumstances. This relatively great spacing of theceramic body from the flame ports of course had the result that theceramic body heated up less rapidly, and the overall efliciency of thebroiler was inadequate. It is to be understood that essent'ially all ofthe radiant heat radiated downwardly from the broiler assembly emanatesfrom the depending ribs 3. The marginal top wall portions 4 and thebridging portion 2 are essentially only physical supports for theseveral ribs 3, whereby the ribs 3 are properly located with respect tothe flame ports 23 in the burner tube and are interconnected in anintegral structure of adequate physical strength.

Since the ceramic bodies are identical in construction they may bereadily replaced or interchanged, breakage of one of the ceramic bodiesrequires only replacement of that particular segment and not an entirelynew ceramic for the whole length of the burner tube in the broiler. Thesmaller size of the ceramic segments, compared with the size of aceramic for the entire length of the broiler burner tube, means thatthey are more easily formed and less susceptible to breakage.

Eachof the ceramic radiants may be provided with a central hole adaptedto register with corresponding threaded openings at the top of ridge 19,so that a screw extending through the opening in the ceramic body andthreadedly received in the aligned opening at the top of the gas burnertube holds the ceramic body in a positive manner on the gas burner tube.This is especially advantageous when it is desired to ship the assemblyof gas burner tube and radiants as a unit.

While there has been described a preferred embodiment of the inventionit is to be understood that modifications and variations of thedescribed embodiment may be resorted to without departing from thespirit and scope of the invention.

I claim:

l. A broiler for a gas stove comprising an elongated horizontal gasburner formed with a plurality of evenly spaced pairs of flame portsalong its side and a plurality of evenly spaced, upwardly projectinglugs along its top, a plurality of transverse ribs formed on the top ofsaid burner adjacent the side thereof and having the upper surfaces ofthe ribs disposed in a common plane, and a plurality of identicalceramic bodies each supported on the upper surfaces of said transverseribs on the burner between adjacent lugs thereon and each formed with aplurality of evenly spaced, thin depending ribs, each said ceramic bodybeing formed at opposite ends with recesses mating with said burner lugsfor snugly positioning the ceramic body between adjacent lugs along thetop of the burner with each of the depending ribs on the ceramic bodydisposed midway between the flame ports forming the adjacent pairthereof and spaced thereabove to be contracted on both sides by theflames at said ports.

2. Apparatus as in claim 1, further characterized by a thin horizontalupper wall interconnecting said depending ribs at the tops thereof andformed with apertures between the ribs to liberate the gases ofcombustion and insure complete combustion at the flame ports.

3. A broiler for a gas stove comprising an elongated horizontal gasburner formed with a plurality of evenly spaced burner ports along bothits sides and a plurality of evenly spaced, upwardly projecting lugsalong its top, a plurality of transverselyextending ribs formed on thetop of the burner adjacent the sides thereof and having flat uppersurfaces disposed in a common plane, and a pinralit'y of identicalceramic bodies supported on the upper surfaces of said ribs on the topof the burner between adjacent lugs thereon and each formed with aplurality of thin depending ribs along both sides of the body spacedapart a distance equal to the spacing between alternate burner ports,each said ceramic body being formed at 4 opposite ends with recessesmating with said burner lugs for snugly positioning the ceramic bodybetween adjacent lugs along the top of the burner with each of thedepending ribs on the ceramic body disposed midway between the flameports composing an adjacent pair thereof and spaced thercabove to becontacted on both sides by the flames at said ports.

4. Apparatus as in claim 3, further characterized by thin horizontalupper walls interconnecting said depending ribs at the tops thereof oneither side of the burner, each said upper wall being formed withapertures located between the ribs and overlying the flame ports toliberate the gases of combustion and insure complete combustion at theflame ports.

5. A broiler for gas stove comprising a horizontal gas burner formedwith a plurality of ports disposed in a row and separated from eachotherby a space, a ceramic body supported on said gas burner, a thinhorizontal wall formed on said body extending outwardly from said gasburner above said flame ports, a plurality of evenly spaced ribsextending outwardly from said body and depending from said wall intoalternate spaces midway between the flame ports on opposite sides ofsaid alternate spaces whereby a pair of flame ports is disposed betweenadjacent ribs, the flame ports on opposite sides of each of saidalternate spaces being disposed on opposite sides of the rib dependingtherebetween and arranged so that the flame from each port impinges onone side of each rib whereby opposite sides of each rib are contacted bythe flame from two separate flame ports, said horizontal wall having anaperture formed therein between each of said ribs and intermediate theends thereof to liberate the gases of combustion and insure completecornbustion'at the burner flame ports.

6. A broiler for a gas stove comprising an elongated horizontal gasburner formed with a plurality of ports disposed in a row along eachside thereof and separated from each other by a space, said burnerprogressively decreasing in depth from the inlet end thereof to the endremote from the inlet to provide more even distribution of the gas tosaid burner ports, a plurality of projections formed on the top of saidburner adjacent the sides thereof having flat upper faces disposed in aplane paralleling said rows of ports, upwardly projecting lugs on saidtop of said burner, a plurality of identical ceramic bodies eachsupported on the upper surfaces of said projections on the top of theburner between adjacent lugs and each formed with a thin wall extendinghorizontally outwardly from opposite sides thereof and overlying saidburner ports, a plurality of ribs extending outwardly from up positesides of said body and depending from said walls and spaced apart adistance equal to the spacing between alternate burner ports, each ofsaid bodies being formed with recesses mating with said burner lugs forsnugly positioning the ceramic body between adjacent lugs along the topof the burner with each of the depending ribs on the ceramic bodyextending into alternate spaces between the burner ports whereby a pairof burner ports is disposed between adjacent ribs, said projections onsaid top of said burner supporting said ceramic body with said ribsspaced above said burner ports whereby each of said ribs is contacted onopposite sides thereof by the flames from the burner ports, said thinhorizontal walls having apertures therein between said ribs to permitthe escape of gases of combustion and insure complete combustion at saidburner ports.

References Cited in the file of this patent UNITED STATES PATENTS879,823 Kehnert Feb. 18, 1908 2,219,787 Parker Oct. 29, 1940 2,235,886Kahn Mar. 25, 1941 2,559,979 Martois July 10, 1951

